/*
 * JBoss, Home of Professional Open Source
 * Copyright 2005, JBoss Inc., and individual contributors as indicated
 * by the @authors tag. See the copyright.txt in the distribution for a
 * full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */
package org.jbpm.pvm.internal.cmd;

import java.util.List;

import org.hibernate.Session;
import org.jbpm.api.Deployment;
import org.jbpm.api.JbpmException;
import org.jbpm.api.ProcessDefinition;
import org.jbpm.api.ProcessInstance;
import org.jbpm.api.cmd.Command;
import org.jbpm.api.cmd.Environment;
import org.jbpm.internal.log.Log;
import org.jbpm.pvm.internal.model.ExecutionImpl;
import org.jbpm.pvm.internal.repository.DeploymentImpl;
import org.jbpm.pvm.internal.repository.RepositoryCache;
import org.jbpm.pvm.internal.session.DbSession;
import org.jbpm.pvm.internal.session.RepositorySession;

/**
 * @author Tom Baeyens
 */
public class DeleteDeploymentCmd implements Command<Object> {

	private static final Log log = Log.getLog(DeleteDeploymentCmd.class
			.getName());

	private static final long serialVersionUID = 1L;

	String deploymentId;
	boolean cascade;

	public DeleteDeploymentCmd(String deploymentId) {
		this.deploymentId = deploymentId;
	}

	public DeleteDeploymentCmd(String deploymentId, boolean cascade) {
		this.deploymentId = deploymentId;
		this.cascade = cascade;
	}

	public Object execute(Environment environment) throws Exception {
		deleteSub(environment, this.deploymentId);
		return null;
	}

	private void deleteSub(Environment environment, String deploymentId) {
		DbSession dbSession = environment.get(DbSession.class);
		List<Deployment> deployments = dbSession.createDeploymentQuery()
				.parentDeploymentId(deploymentId).list();
		if (deployments != null) {
			for (Deployment d : deployments) {
				deleteSub(environment, d.getId());
				deleteById(environment, d.getId());
			}
		}
	}

	private void deleteById(Environment environment, String deploymentId) {
		RepositorySession repositorySession = environment
				.get(RepositorySession.class);
		List<ProcessDefinition> processDefinitions = repositorySession
				.createProcessDefinitionQuery().deploymentId(deploymentId)
				.list();

		DbSession dbSession = environment.get(DbSession.class);

		for (ProcessDefinition processDefinition : processDefinitions) {
			String processDefinitionId = processDefinition.getId();
			List<String> processInstanceIds = dbSession
					.findProcessInstanceIds(processDefinitionId);

			if (cascade) {
				for (String processInstanceId : processInstanceIds) {
					dbSession.deleteProcessInstance(processInstanceId, true);
				}

				dbSession.deleteProcessDefinitionHistory(processDefinitionId);

			} else {
				if (!processInstanceIds.isEmpty()) {
					throw new JbpmException("cannot delete deployment "
							+ deploymentId + ": still executions for "
							+ processDefinition + ": " + processInstanceIds);
				}
			}
		}

		Session session = environment.get(Session.class);
		DeploymentImpl deployment = (DeploymentImpl) session.load(
				DeploymentImpl.class, Long.parseLong(deploymentId));
		log.debug("deleting deployment " + deploymentId);
		session.delete(deployment);

		RepositoryCache repositoryCache = environment
				.get(RepositoryCache.class);
		repositoryCache.remove(deploymentId);
	}
}
